I’ve heard jellyfin has a lot of security issues
The biggest known stuff I saw on their GitHub is that a number of the exposed service URLs under the hood don't require auth. So, it's open-source with known requirements, you can tell easily from the outside that it's running, and you can cause it to activate a LOT of packages without logging in. That's a zero-day in any package that can be passed a payload away from disaster.
AS far as TVOS, I'm kinda surprised swiftfin doesn't service you.